检测激光晶体侧面致冷均匀性的马赫-泽德干涉法  

Mach-Zehnder interferometry for detecting side cooling uniformity of laser medium

作　　者：肖孟超[1] 郝二娟[1] 吕彦飞[2] 檀慧明[1] 钱龙生[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所 [2]长春理工大学,吉林长春130022

出　　处：《光学精密工程》2007年第6期841-845,共5页Optics and Precision Engineering

基　　金：国家863计划资助项目(No.2002AA311140)

摘　　要：提出了一种基于马赫-泽德干涉仪的检测法。理论分析表明,该法检测到的物光与参考光的干涉条纹即为晶体径向平面上的等温线。通过热分析软件对均匀和非均匀致冷晶体温度场的模拟表明,当检测到的干涉条纹为以晶体径向平面中心为圆心的圆环时,晶体周边接触良好,致冷均匀;当检测到的干涉条纹向某一方向扭曲时,该方向上致冷块与晶体边界接触不好。对装在铜致冷座里的3 mm×3 mm×5 mm,a切割,0.5%Nd3+掺杂的Nd∶YVO4晶体进行了检测,根据检测到的干涉条纹扭曲方向重新安装了致冷座,获得了以端面中心为圆心的干涉环。实验结果与理论分析相符,证明马赫-泽德干涉法可以检测晶体侧面致冷均匀性。For detecting side cooling uniformity of laser medium, a detecting method based on Mach Zehnder interferometer is presented. Theoretical analysis indicates that the interference fringe pro duced by a reference beam and a beam passing the medium is also isotherm on the radial face of the la ser medium. The simulations on the temperature fields of uniformly and non-uniformly cooled medi ums by heat analysis software indicate that. if the interference fringe is circle with the center of the ra dial face as the center, the sides of the medium contact closely with the copper cooler, the medium is cooled uniformly. If the interference fringe is distorted to a certain direction, the medium contacts loosely with the copper cooler in the direction. In the experiment, a distorted interference fringe is ob tained by detecting a 3 mm×3 mm×5 mm sized, α-cut, 0.5% Nda^3＋-doped Nd： YVO4 embedded in a copper cooler. A circular interference fringe is obtained after reassembling the copper cooler according to the distorted direction of the distorted interference fringe. Experimental result agrees with the the oretical analysis very well, it has proved that Mach-Zehnder interferometry can detect side cooling uni formity of laser medium.

关 键 词：马赫-泽德干涉法 激光晶体 热光效应 侧面致冷 

分 类 号：TN244[电子电信—物理电子学] O436.1[机械工程—光学工程]